WMG / Yami to Boushi to Hon no Tabibito

Chikane and Himeko in Destiny of the Shrine Maiden are "book reincarnations" of Eve and Hazuki.

Eve is not above writing multiple versions of a character (Hazuki herself exists in two books, albeit they are tracking copies of one another). She has been known to mess with peoples' "destinies" as well (Gargantua, Ritsuko, etc). The characters in question are very, very similar-looking, especially Chikane and Hazuki, and they share personality traits, too.